Combined down-the-hole hammer capable of adjusting size of eccentric drill bit

The utility model discloses a combined down-the-hole hammer capable of adjusting the size of an eccentric drill bit, which comprises a down-the-hole hammer body and a central drill bit coaxially arranged with the down-the-hole hammer body, and the eccentric drill bits distributed in an annular array are arranged around a rotating shaft of the central drill bit. The eccentric drill bit is connected with the down-the-hole hammer body through a size adjusting mechanism and a locking mechanism. The device is simple in structure and convenient to use, the adjustment operation of the eccentric drill bit can be simplified, the adjustment accuracy is improved, the labor amount of workers is effectively reduced, and the punching work can be smoothly carried out. 本实用新型公开了一种可调节偏心钻头尺寸的组合式潜孔锤，包括潜孔锤本体和与其同轴设置的中心钻头，所述中心钻头的转轴周围设置有呈环形阵列分布的偏心钻头，所述偏心钻头通过尺寸调整机构和锁定机构与所述潜孔锤本体相连。本实用新型结构简单、使用方便，能够简化偏心钻头的调校操作，提高调节精确度，有效减轻了工人劳动量，有利于打孔工作的顺利进行。